fix(cfstat event): not publish NodetoolEvent when waiting for space_node_threshold
fix(cfstat event): not publish NodetoolEvent when waiting for space_node_threshold

Don't need NodetoolEvent when waiting for space_node_threshold before start the nemesis, not publish it

scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests